Drill-chuck.



PATENTED AUG. 21, 1906.

G. H. HOLLM. DRILL CHUCK.

APPLIUATION FILED JUNE 29. 1904.

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DRILL-CHUCK.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed June 29, 1904:. Serial No. 214,672.

To all whmrt it may concern.-

Be it known that I, GUSTAV H. HOLLM, a citizen of the United States, anda resident of Fairfield, in the county of l airlield and State ofConnecticut, have invented certain new and useful Improvements inDrill-Chucks, of which the following is a specification.

My invention relates to new and useful improvcn'ients in drill-chucks,such as are used for attachment to the spindle of drill-presses and likemachines to hold tools of various kinds and sizes.

It is the object of the invention to improve upon devices of this classby simplifying and cheapening the cost of manufacture and at the sametime to produce a strong and dura ble chuck that may be quickly operatedto re lease the tool when the spindle carrying it is either still orrotating, and, finally, to provide means, such as detachable collets,for accommodating different size tools.

With the above and other minor objects in view my invention resides andconsists in the novel construction and combination of parts shown uponthe accompanying sheet of drawings, forming a part of thisspecification, upon which similar characters of reference denote like orcorresponding parts throughout the several figures, and of which Figure1 is a central vertical ltmgitudinal section elevation of my improveddevice, taken 011 line 1 l of Fig. 3. Fig. 2 is a central verticallongitudinal section elevation, taken at a right angle to Fig. 1 andindicated by line 2 2 of Fig. 8. Fig. 3 is a transverse crosssection ofthe invention, taken on line 3 3 of Fig. 2; and Fig. 4 is a detail sideelevation of the collet detached.

Referring in detail to the characters of reference marked upon thedrawings, A indicates the body, which is provided with a tapering shankB, adapted to fit in the socket of the rotatable spindle of adrill-press or other suitable machine-tool.

C is a cylindrical pocket within the body to receive the collet D forcarrying a tool, (not shown,) such, for instance, as a tap or drill.Several of these collets are provided with each chuck and each contain atapering recess E of a different size in order to accommodate varioussizes and styles of tools. Within the body and through the pocket isarranged a pair of round pins F F, which are loosely fitted in oblongopenings G in a Way to afford a slight sidewise and rotary movement ofthe pins therein and with respect to both the body and collet. Thepurpose of these pins, as will be apparent, is to engage shoulderedsockets preferably formed by the concave-convex sides of the reducedtransverse head H on the upper end of the collet. Upon the annularsurface of the body is fitted a sleeve 1, having a tapering internalannula wall J to engage the rounded ends K of the pins in a manner tomove the same sidewise in their oblong holes and close them together toengage the concave shoulder of the head of the collet. The lower end ofthe sleeve is provided with a washer L, which is attached by means ofscrews, forming a bearing and serving to limit the upward movement ofthe sleeve on the body.

In the operation of my device the collet is attached by first raisin thesleeve 1 up to release the pins, after wlnch the collet is inserted andits transverse head shoved in between the rotatable and slidable pinsuntil it fetches up against the same, when the sleeve is dropped, itstapering wall engaging the ends of the pins in a manner to force thesame in under the shoulders of the head to rigidly hold the collet in away to drive the same. It will be obvious that the collet is removed bysimply raisin the sleeve to release the pins, when said col et is freeto be withdrawn.

The special advantages contained in the above construction resides in'the employment of the parallel transverse pins which 0 crate inconnection with the broad side of t e collet-head, thus insuring apositive, strong, and durable engagement. The pins being round andmounted at their ends in oblong bearings serve not only to move in andout to engage the collet, but are also susceptible of a rotary movementwhen engaged by the head of the collet, thus insuring an easy insertionor removal of the collet.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is a 1. In a drill-chuck of the class described, thecombination with a body adapted for attachment to a driven spindle andhaving a pocket, of round pins arranged transversely through said bodyand pocket and fitted in oblong openin s on either side of the body soas to be movab e toward and from each other, a collet Within the pocketto receive a tool and having a head. with a transverse shoulder oneither side for the engagement of the sides of the pins, and means forforcin said ins toward each other under the shou ders 0 the head of thecollet in a way to hold the same.

2. In a drill-chuck of the class described, the combination with a bodyhaving a pocket and oblon openings, of a collet to fit the pocket anhavin a tool-socket and a transverse shouldered iead, pins arrangedtransversely through the oblong opening of the body so as to be movabletoward and from each other and across the pocket on either side of thehead to engage the socket of the same and means for providing a sidewiseand rotary movement of the pins to and from the head and means forholding the pins in en- 15 gagement with the head of the oollet toretain the same.

Signed at Brid e ort, in the county of Fairfield and State fionnectiout, this 26th day of May, A. D. 1904.

GUSTAV H. HOLLM.

Witnesses:

C. M. NEWMAN, W. V. Dnvrr'r.

